Decorative gusset



FIG. 1 is a top perspective view of a decorative gusset;

FIG. 2 is a top view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left-side view thereof; and,

FIG. 6 is a right-side thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a decorative gusset, as shown and described. 